Patents by Inventor Jun Hang Lee

Jun Hang Lee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for monitoring optical signal-to-noise ratio (OSNR) using polarization-nulling method
    Patent number: 6813021
    Abstract: The present invention relates to a method and apparatus for automatically monitoring an optical signal-to-noise ratio in which an arbitrarily polarized optical signal including an unpolarized ASE noise is inputted to a rotating quarter-wave plate and then to a rotating linear polarizer so that a maximum power and a minimum power of the signal outputted from the rotating linear polarizer can be detected, and the detected maximum power and minimum power is used for automatically monitoring the optical signal-to-noise ratio.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: November 2, 2004
    Assignee: Teralink Communications, Inc.
    Inventors: Yun Chur Chung, Chul Han Kim, Dae Kwang Jung, Jun Hang Lee
  • Method and apparatus for monitoring optical signal-to-noise ratio (OSNR) using polarization-nulling method
    Publication number: 20010052981
    Abstract: The present invention relates to a method and apparatus for automatically monitoring an optical signal-to-noise ratio in which an arbitrarily polarized optical signal including an unpolarized ASE noise is inputted to a rotating quarter-wave plate and then to a rotating linear polarizer so that a maximum power and a minimum power of the signal outputted from the rotating linear polarizer can be detected, and the detected maximum power and minimum power is used for automatically monitoring the optical signal-to-noise ratio.
    Type: Application
    Filed: January 24, 2001
    Publication date: December 20, 2001
    Inventors: Yun Chur Chung, Chul Han Kim, Dae Kwang Jung, Jun Hang Lee